Well.. Indiana Jones does explain how some stunts are done.
Epcot was supposed to be an actual city. And the "world's fair" part was going to be fairly small exhibits explaining how various parts of the city worked. Think carousel of progress. And you would be able to see, and tour the city as well. The city got killed, the concept lived on, the pavilions got HUGE, and the travel agencies got involved (welcome to world showcase, it looks so much better than a brochure.. you can fly Delta to see all these places, just bigger, and you know, a lot older).
They have doggedly stuck to that concept. And they can, at this point, either bag it entirely, or double down on it. The first means that in 20 years, Epcot as we know it will pretty much be gone, at least as far as future world is concerned. The second means the pavilions become temporary show spaces.. and the contents rotate out regularly, making way for new content.
Either is going to tick someone off. But something needs to be done. It's old and busted.